Matt Hurt’s review published on Letterboxd :
When Jeff Tried to Save the World had a lot of charm and shows a lot of promise for Kendall Goldberg as a filmmaker. Jon Heder does a fine, understated job as Jeff. He internalizes Jeff's anxieties and fears and carries that through his performance well. There are some cool visual effects that I wasn't expecting in the movie and I really dug the score.
All in all, pretty good.
Filmmaker Interview: OV253 – HIFF2018: Part III – The Samuel Project Review and Filmmaker Interviews: When Jeff Tried to Save the World, Palace, Fiddlin’, Film School Africa, Live the Stream, Bullitt County, Miss Arizona, and A Thousand Miles Behind